Cylinder reboring-plate



1937- E. RMIcHENER 3,

CYLINDER REBORING PLATE Fi'led Oct. 9, 1935 lllh 6 7 llw 4 7 14 roJeMEyPatented Dec. 28 1937 PATET OFFICE 5 VI ER REBORING-PLATE ApplicationOctober 9, 1935, Serial No. 44,139

2 (Hal.

This invention relates to a certain new and useful improvement incylinder reboring-plates. In the reboring of the worn cylinders of theengine or motor of an automobile, it is, so far as 5 I am aware, thepresent general practice, necessitated by the structure of the engineand automobile, to first remove the cylinder-block from the chassis andthen remove the cylinder-block head and its securing-studs, as well asalso the valves and pistons and their associate parts, to permit properoperative placement of the cylinder boring-tool,a practice both time andlabor consuming and consequently more or less expensive.

My invention has hence for its chief object the provision of means inthe form generally of an apertured plate for attachment to and upon thecylinder-block for permitting placement of the tool for emcientVexpeditious cylinder-reboring without dismantling of the motor orremoval thereof from the chassis.

And with the above and other objects in view, my invention resides inthe novel features of form, construction, arrangement, and combinationof parts presently described and pointed out in the claims.

In the accompanying drawing,-

Figure 1 is a plan view of a cylinder surface reboring-plate embodyingmy invention, illustrated in applied boring or operative position on acylinder-block or motor;

Figure 2 is a view of the plate and block taken approximately on theline 2-2, Figure 1;

Figure 3 is an inverted plan view of the plate; and

Figure 4 is a view of the plate and block taken approximately on theline 4-4, Figure 1, fragmentally also illustrating in outline a cylinderboring-tool in connection therewith.

Referring now more in detail and by reference characters to theaccompanying drawing, which illustrates a preferred embodiment of myinvention, A designates the cylinder-block of an internalcombustion-engine, and B designates a cylinder-reboring tool of anystandard type, the block A having a plurality of cylinders l and being,as is usual, equipped with a plurality of spaced, upstanding studs 2, 3,and 4, 4', for securement of the cylinder-head and also with a pluralityof valves 5.

Heretofore, as I have stated, it is required, in reborlng theengine-cylinders when worn, according to present day general practice,to not only remove the entire block It from the chassis of-theautomobile, but to also remove the various head-securing studs andvalves 5 for properly placing and securing the tool B upon the block Afor eflicient cylinder reboring.

According to my invention, however, I provide a rigid preferablymetallic plate C of suitable thickness and preferably of oblongrectangularcontour, as shown, conformable with the usual surface contourof the cylinder-block A, the plate C being formed on its under face witha plurality of depending legs 8 and lugs I, 8, for supporting the plateC flatwise over, and in suitably spaced relation upwardly from the upperface of, the block A. I

It will be understood that, prior to placement of theplate C on theblock A, the usual cylinderhead, not shown, has been removed, leavingupstanding the head-se'curing studs 2, 3, I, and 4, which vary inlength, and it may be here stated that, when in operative position,the'space intermediate the under face of plate C and the upper face ofthe block A is in width preferably slightly less than the length of theshortest studs 2. For then accommodating the upper end-portions of theshortest studs 2, the plate C is provided on its under face withopenings in the form of recesses 9, and for likewise accommodating theupper end-portions of some of the remaining studs 3 and 4, the plate Cis formed with openings in the form of transverse apertures; as at Inaddition, the depending lugs 'l, 8, are each preferably formed withlongitudinal bores, as at H, opening at their lower end upon the underface of the plate and, at their upper end in counter-bores, or recesses,as at l2, l2, in the upper face of the plate, for snugly accommodatingsome of the longer studs 4' and studengaging-members or nuts I 3, It,for detachably fastening the plate C tightly on and over the block A forboring operations. Preferably, as best seen in Fig. 4, the counter-boreor recess 13', which is in registration with the bore ll 01' the lug 8,is of greater depth for accommodating a particular or speciallyconstructed securlug-member I? for engaging a shorter stud 3.

For purposes presently appearing, the plate C is centrally provided witha pair of suitably spaced-tapped openings i4, and, in addition, theplate C is formed with a suitable plurality of transverse openings, asat ii, for registration, the plate 0 being operatively disposed on theblock A, with the respective cylinders I thereof.

Accordingly, in use and practice and for a cylinder reboring-operation,the head of the cylinder-block A is removed, thereby exposing the usualstuds, as well as also the pistons and their directly connected parts,the block A, however, remaining in installed position on the chassis andthe valves 2 being undisturbed. The enginepistons being now removed, theplate C is' rested upon the block A with the respective studs 2, 3, 4,and 4', projecting upwardly with their upper endportions disposed in therespectively registering openings or bores 9, l0, H, the fasteningmembers l3, I3, being then engaged withrespective studs 3, 4', forrigidly securing the plate in position fiatwise over, and in suitablyspaced relation from the upper face of, the block A, with its aperturesIS in boring-registration with the respective cylinders l.

A tool B may now be disposed, and by means of securing screws l6 engagedwith one or the other of the tapped-openings ll, secured firmly, uponthe plate C for boring operations, the tapped-openings l4 permitting thetool B to be shifted on the block A for operating in the respectivecylinders i thereof.

Thus the plate C enables a reboring operation to be quickly, emciently,and expeditiously effected, the plate C eliminating the presentnecessity of dismantling themotor or removing the motor from the frame,with an accruing saving to a large degree in time, labor, and expense.The plate 0 may be readily manufactured, is exceedingly durable, and ismost eflicient in the performance of its intended functions.

It is to be understood that changes in the form, construction,arrangement, and combination of the several parts of the plate and inits engagement with the cylinder-block may be made and substituted forthose herein shown and described bolts upstanding from a plane-surfacedface thereof adapted to receive a cylinder head comprising, a metallicplate portion having an upper plane-surfaced face, legs on the lowerside of the plate to engage the plane face of the cylinder block andhaving their ends terminating in a' plane substantially parallel to the'upper plane face of the plate, said legs being of suflicient length toposition said plane face above the outer ends of the stud bolts and theplate bein provided with openings to receive said stud bolts.

prising, a metallic plate portion having an upper plane-surfaced face,legs on the lower side of the plate to engage the plane face of thecylinder.

block and having their ends terminating in a plane substantiallyparallel to the'upper plane faceof the plate, said legs being ofsumcient length to position said plane face above the outer ends of thestud bolts and the plate being provided with openings to receive saidstud bolts and being countersunk in its plane face around certain ofsaid stud bolts, and means received upon the stud bolts within thecountersunk recesses to thus rigidly secure the fixture in place andleave the outer face thereof unobstructed and in a plane substantiallyparallel with and spaced from the plane face of the cylinder block 'toreceive and support a boring tool, said plate further being aperturedfor permitting free tool-access to the cylinders being bored.

EDWARD R. MICHEN'ER;

